Fan

Abstract

The utility model relates to the technical field of fan devices, in particular to a fan. A fan comprises rotatable fan blades and a housing provided with the fan blades, an air inlet and an air outlet are formed in the two axial ends of the housing respectively, and a first grating assembly and a second grating assembly are sequentially arranged at the air outlet of the housing in the air outlet direction. The first grating assembly and the second grating assembly are each composed of a plurality of first guide plates and second guide plates which are evenly arranged at intervals in the circumferential direction, and the connecting lines of the two radial ends of the first guide plates and the second guide plates do not penetrate through the circle center so that the first guide plates and the second guide plates can be arranged in an offset mode in the radial direction. The deviation direction of the first flow guide plate is opposite to that of the second flow guide plate, and the first flow guide plate and the second flow guide plate have at most one intersection point in the axial direction. The fan has the advantages that turbulent flow in air flow is reduced, so that the blowing efficiency of the fan is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of fan devices, and in particular to a fan. Background Art

[0002] Fans are typically equipped with grilles to prevent fingers or other small objects from being pinched by the fan blades, ensuring safety during use. They also prevent foreign objects, such as dust, oil, and insects, from entering the fan, thereby protecting the fan from damage and extending its service life. For example, Chinese patent application number 202420269933.X discloses a double-layer fan head assembly and disassembly structure comprising a fan cover (grill) and main fan blades disposed within the fan cover.

[0003] The grille in the above patent is shaped like a radial mesh structure, and is hollowed out in both radial and axial directions. Therefore, when the fan blades are rotating, the wind direction and wind speed are relatively unstable, and the wind flow easily forms turbulence, which leads to energy loss of the wind flow and low efficiency of the fan. The formation of turbulence will cause greater wind resistance and cause the entire fan to produce greater noise. Summary of the Invention

[0004] In order to solve the deficiencies in the prior art, a fan is provided which reduces the formation of turbulence in the wind flow, thereby making the fan more efficient and less noisy.

[0005] The utility model is implemented by the following technical scheme: a fan comprises rotatable fan blades and a cover shell equipped with the fan blades, the axial ends of the cover shell are respectively an air inlet and an air outlet, the air outlet of the cover shell is sequentially provided with a first grille assembly and a second grille assembly along the air outlet direction, the first grille assembly and the second grille assembly are respectively composed of a plurality of first guide plates and a second guide plates arranged at uniform intervals along the circumferential direction, the connecting lines of the radial ends of the first guide plates and the second guide plates do not pass through the center of the circle, so that the first guide plates and the second guide plates are offset in the radial direction, the offset direction of the first guide plates is opposite to the offset direction of the second guide plates, and some of the first guide plates and the second guide plates have an intersection in the axial direction.

[0006] The fan's wind flow is guided for the first time through the first guide plate to reduce the generation of turbulence and thus reduce energy loss. The wind flow is then guided for a second time through the second guide plate. Since the radial offset direction of the second guide plate is opposite to that of the first guide plate, the wind flowing out of the first guide plate will hit the second guide plate, causing the second guide plate to guide the wind for a second time, thereby further reducing the generation of turbulence and thus further reducing energy loss, thereby making the entire fan more efficient. The secondary guidance of the wind flow makes the wind direction and wind speed more stable and the wind resistance is reduced, so that the wind flow can be blown out more concentratedly with a higher wind speed, thereby reducing the noise of the entire fan.

[0007] The first grille component, the second grille component and the fan blades are all coaxially arranged.

[0008] The air inlet is provided with a mesh cover similar to that of any existing fan, so as to prevent dust from entering.

[0009] Preferably, the thickness of the first guide plate gradually increases along the air outlet direction.

[0010] The thickness of the first guide plate gradually increases from back to front along the air outlet direction. The rear side of the first guide plate is the first part to come into contact with the wind from the fan blade, so setting its thickness smaller can reduce the resistance to the wind, facilitate air diversion, and reduce noise.

[0011] Preferably, the first guide plate itself is arranged to be deflected along the air outlet direction, and the projections of the rear end and the front end of the first guide plate in the axial direction do not overlap.

[0012] The first guide plate is deflected and the projections of the rear end and the front end of the first guide plate in the axial direction do not overlap, so that the first guide plate of the overall first grille is spirally arranged. When looking directly at the first guide plate, the rear edge of the guide plate can be seen; this arrangement can further guide the windflow.

[0013] Preferably, the first grille assembly includes a first inner ring and a first outer ring arranged concentrically, the first guide plate is arranged between the first inner ring and the first outer ring, the first inner ring has an axial length, and the diameter of the first inner ring gradually increases along the blowing direction so that the outer wall of the first inner ring forms a guide cone surface, so that the distance between the first inner ring and the first outer ring gradually decreases along the blowing direction.

[0014] Through the guide cone surface, the distance between the first inner ring and the first outer ring is gradually reduced from back to front along the blowing direction, so that the space for wind flow is reduced from large to small, thereby regulating the wind flow, making the wind speed faster and the noise lower.

[0015] Preferably, the fan blade includes a fan blade center part and blades arranged on the circumferential outer wall of the fan blade center part, the fan blade center part is coaxially arranged with the first inner ring, and the outer diameter of the fan blade center part is the same as the outer diameter of the rear end of the first inner ring.

[0016] The outer diameter of the central portion of the fan blade is the same as the outer diameter of the rear end of the first inner ring, thereby ensuring that the guide cone surface can guide the wind generated by the entire blade.

[0017] Preferably, the number of the second guide plates is greater than the number of the first guide plates.

[0018] The number of the second guide plates is greater than that of the first guide plates, so that the second guide plates are denser, which can further reduce the generation of turbulence.

[0019] Preferably, the cover shell includes a first shell having a first grille component and a second shell having a second grille component, the first shell and the second shell are separately arranged and connected to each other, the second grille component includes a second inner ring and a second outer ring arranged concentrically, the second guide plate is arranged between the second inner ring and the second outer ring, and the inner diameter of the front end of the second outer ring gradually decreases along the air outlet direction, so that the distance between the second inner ring and the second outer ring gradually decreases along the air outlet direction.

[0020] The inner diameter of the front end of the second outer ring gradually decreases from back to front along the air outlet direction, so that the distance between the second inner ring and the second outer ring gradually decreases along the air outlet direction, thereby reducing the aperture through which wind can flow, thereby increasing wind speed and reducing noise.

[0021] Preferably, the axial projections of the front and rear ends of the second guide plate are arranged to overlap, and the second guide plate includes an inner guide plate and an outer guide plate arranged integrally along its radial direction. The axial length of the second outer ring and the second inner ring is the same, and the inner guide plate extends from the rear end of the second inner ring to half of the second inner ring along the air outlet direction, and the outer guide plate extends from the rear end of the second outer ring to the front end opening of the second outer ring along the air outlet direction.

[0022] Because the first deflector is spiral-shaped, the wind directed by the first deflector is distributed in a spiral pattern. The wind received by the outer deflector has a larger deflection angle and a higher wind speed than the wind received by the inner deflector. Therefore, the outer deflector is set longer to extend the deflection time, so that the wind is concentrated and blown out from the air outlet of the second shell. The wind deflection angle of the inner deflector is smaller, and the wind speed is not as high. Therefore, to avoid energy loss, the length of the inner deflector is set to half the axial length of the second outer ring and the second inner ring, which satisfies the wind diversion and blowing requirements.

[0023] Preferably, the distance between the end of the inner guide plate deviating from the center of the circle and the second inner ring is equal to the distance between the outlet of the second inner ring and the outlet of the second outer ring.

[0024] The above arrangement enables the wind to flow directly out from the outlets in the second inner ring and the second outer ring brackets when flowing through the inner guide plate, thereby avoiding the loss of wind energy.

[0025] Preferably, a drive motor is provided in the center of the fan blade, and a battery and a circuit board for driving the motor are provided inside the second inner ring of the second shell; the fan is also provided with a base, the cover is located at the upper end of the base and is rotatably connected to the base, and a reversible hook is provided at the bottom of the base, which is used to hang the entire fan upside down.

[0026] The second inner ring of the second shell is equipped with a battery and a circuit board for driving the motor, which can make the entire fan structure more compact; the fan can be supported on a horizontal plane by the base, or the cover can be rotatably connected to the base. After the hook hangs the entire fan upside down, the cover can be rotated so that the fan blows air downward.

[0027] Compared with the prior art, the utility model has the advantages of improving the blowing efficiency of the fan, making the wind speed faster and the noise lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 for Figure 1 Rear view;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure after removing the outer shell;

[0031] Figure 4 This is a front view of the fan outlet;

[0032] Figure 5 for Figure 4 Front view after removing the second grille assembly;

[0033] Figure 6 for Figure 4 sectional view of

[0034] Figure 7 is a cross-sectional view of the second grille assembly;

[0035] Figure 8 are front and rear views of the second grille assembly;

[0036] Figure 9 is a cross-sectional view of the first grille assembly;

[0037] Figure 10 Front and rear views of the first grille assembly;

[0038] Figure 11 Schematic structural diagram when the hanging buckle is opened.

[0039] Reference numerals in the drawings: 1, outer shell; 11, base; 111, rotating connection part; 12, rear grille; 13, hanging buckle; 2, housing; 21, first housing; 22, second housing; 31, first inner ring; 32, first outer ring; 33, first guide plate; 34, guide conical surface; 35, jack; 41, second inner ring; 42, second outer ring; 43, second guide plate; 431, inner guide plate; 432, outer guide plate; 44, battery; 45, plug-in buckle; 51, blade; 52, center part of the fan blade; 53, motor cavity; 6, button. Detailed implementation manners

[0040] The present utility model will be further described below with reference to the drawings and specific embodiments.

[0041] As Figures 1 to 3 and Figure 11 shown, this embodiment discloses a fan, which includes a base 11 and an outer shell 1 rotatably connected to the base 11. The base 11 is in an inverted "冂" shape, and a rotating connection part 111 is provided on the inner side of the upper end of the base 11. The rotating connection part is rotatably connected to the outer wall of the outer shell 1 so that the blowing angle of the fan can be changed. A flip-up hanging buckle 13 is provided at the bottom of the base 11, and the hanging buckle 13 is used to hang the entire fan in an inverted manner. Both ends of the outer shell 1 are axially open, an air inlet is provided at the rear end, and an air outlet is provided at the front end. Any existing rear grille 12 is provided at the air inlet at the rear end. The outer shell 1 is sleeved outside the housing 2. The housing 2 successively includes a first housing 21 and a second housing 22 from the rear to the front along the air outlet direction. A first grille assembly and a second grille assembly are respectively provided in the first housing 21 and the second housing 22.

[0042] As Figure 3 , Figure 6 , Figure 7 and Figure 9 shown, the first housing 21 and the second housing 22 are fixed to each other through the plug-in fit of the plug-in buckle 45 and the jack 35. Or screws or glue can also be used for fixing. A rotatable fan blade is provided in the first housing 21. The fan blade includes a center part 52 of the fan blade and blades 51 provided outside the center part 52 of the fan blade. The first grille assembly is located at the front end of the fan blade in the axial direction.

[0043] As Figure 5 , Figure 6 , Figure 9 and Figure 10As shown, the first grille assembly comprises a concentrically arranged first inner ring 31 and a first outer ring 32. The rear end outer diameter of the first inner ring 31 is identical to the outer diameter of the blade center 52, and the two are concentrically arranged. A plurality of first deflectors 33 are disposed between the first inner ring 31 and the first outer ring 32, and are evenly spaced along the circumference. The first outer ring 32 actually serves as the shell of the first housing 21. Specifically, the radial ends of the first deflectors 33 are connected to the outer wall of the first inner ring 31 and the inner wall of the first outer ring 32 (the inner wall of the first housing 21), respectively. The first inner ring 31 is disposed at the opening of the first housing 21 and has an axial length. The diameter of the first inner ring 31 gradually increases from rear to front in the blowing direction, forming a deflector cone 34 on the circumferential outer wall of the first inner ring 31. This causes the distance between the outer wall of the first inner ring 31 and the inner wall of the first outer ring 32 to gradually decrease from rear to front in the blowing direction.

[0044] The line connecting the radial ends of the first deflector 33 does not pass through the center of the circle, resulting in the first deflector being offset in the radial direction. The thickness of the first deflector 33 gradually increases from rear to front along the airflow direction. The first deflector 33 itself is deflected in the airflow direction, and the axial projections of the rear and front ends of the first deflector 33 do not overlap.

[0045] like Figure 6 、 Figure 7 、 Figure 8 The second grille assembly comprises a concentrically arranged second inner ring 41 and second outer ring 42, with a plurality of second deflectors 43 evenly spaced circumferentially between the second inner ring 41 and the second outer ring 42. The second outer ring 42 effectively forms the shell of the second housing 22. The radial ends of the second deflectors 43 are connected to the outer wall of the second inner ring 41 and the inner wall of the second outer ring 42 (the inner wall of the second housing 22), respectively. The inner diameter of the front end of the second outer ring 42 gradually decreases from rear to front along the airflow direction, causing the distance between the second inner ring 41 and the second outer ring 42 to gradually decrease along the airflow direction.

[0046] The line connecting the radial ends of the second deflector 43 does not pass through the center of the circle, resulting in the second deflector 43 being offset in the radial direction. The second deflector 43 has a uniform thickness along the blowing direction, so that the axial projections of its front and rear ends coincide. The second deflector 43 comprises an integral inner deflector 431 and an outer deflector 432 along its radial direction. The second outer ring 42 and the second inner ring 41 have the same axial length. The inner deflector 431 extends from the rear end of the second inner ring 41 to halfway along the outlet direction, while the outer deflector 432 extends from the rear end of the second outer ring 42 to the front opening of the second outer ring 42. The distance between the offset end of the inner deflector 431 and the second inner ring 41 is d, and the distance between the outlet of the second inner ring 41 and the outlet of the second outer ring 42 is D, where d=D.

[0047] like Figure 4 and Figure 5 As shown, the offset direction of the first guide plate 33 is opposite to the offset direction of the second guide plate 43, the number of the first guide plates 33 is less than the number of the second guide plates 43, the second guide plates 43 are denser, and the first guide plates 33 and the second guide plates 43 are staggered in the axial direction, so that most of the first guide plates 33 and the second guide plates 43 have an intersection in the axial direction.

[0048] like Figure 1 、 Figure 6 and Figure 7 As shown, the central portion 52 of the fan blade is provided with a motor cavity 53 for accommodating the stator and rotor assembly of the motor (not shown), and the battery 44 and circuit board (not shown) for driving the motor are located inside the second inner ring 41. A button 6 for controlling the rotation of the fan blade is provided on the axial end face of the second inner ring 41.

Claims

1. A fan comprising rotatable blades and a housing housing the blades, wherein the housing has an air inlet and an air outlet at two axial ends, respectively, and characterized in that: The air outlet of the cover shell is provided with a first grille assembly and a second grille assembly in sequence along the air outlet direction. The first grille assembly and the second grille assembly are respectively composed of a plurality of first guide plates and second guide plates arranged evenly spaced along the circumferential direction. The connecting lines at the radial ends of the first guide plates and the second guide plates do not pass through the center of the circle, so that the first guide plates and the second guide plates are offset in the radial direction. The offset direction of the first guide plate is opposite to the offset direction of the second guide plate, and some of the first guide plates and the second guide plates have an intersection in the axial direction.

2. The fan according to claim 1, wherein: The thickness of the first guide plate gradually increases along the air outlet direction.

3. The fan according to claim 2, wherein: The first deflector itself is arranged to be deflected along the air outlet direction, and the projections of the rear end and the front end of the first deflector in the axial direction do not overlap.

4. The fan according to claim 1, 2 or 3, characterized in that: The first grille assembly includes a first inner ring and a first outer ring arranged concentrically, the first guide plate is arranged between the first inner ring and the first outer ring, the first inner ring has an axial length, and the diameter of the first inner ring gradually increases along the blowing direction so that the outer wall of the first inner ring forms a guide cone surface, so that the distance between the first inner ring and the first outer ring gradually decreases along the blowing direction.

5. The fan according to claim 4, characterized in that: The fan blade includes a fan blade center part and blades arranged on the circumferential outer wall of the fan blade center part. The fan blade center part is coaxially arranged with the first inner ring, and the outer diameter of the fan blade center part is the same as the outer diameter of the rear end of the first inner ring.

6. The fan according to claim 1, 2 or 3, characterized in that: The number of the second guide plates is greater than the number of the first guide plates.

7. The fan according to claim 1, wherein: The cover shell includes a first shell having a first grille component and a second shell having a second grille component. The first shell and the second shell are separately arranged and connected to each other. The second grille component includes a second inner ring and a second outer ring arranged concentrically. The second guide plate is arranged between the second inner ring and the second outer ring. The inner diameter of the front end of the second outer ring gradually decreases along the air outlet direction, so that the distance between the second inner ring and the second outer ring gradually decreases along the air outlet direction.

8. The fan according to claim 7, wherein: The axial projections of the front and rear ends of the second guide plate are arranged to overlap, and the second guide plate includes an inner guide plate and an outer guide plate arranged integrally along its radial direction. The axial lengths of the second outer ring and the second inner ring are the same. The inner guide plate extends from the rear end of the second inner ring to half of the second inner ring along the air outlet direction, and the outer guide plate extends from the rear end of the second outer ring to the front end opening of the second outer ring along the air outlet direction.

9. The fan according to claim 8, characterized in that: The distance between the end of the inner guide plate that deviates from the center of the circle and the second inner ring is equal to the distance between the outlet of the second inner ring and the outlet of the second outer ring.

10. The fan according to claim 7, 8 or 9, characterized in that: A drive motor is provided in the center of the fan blade, and a battery and a circuit board for driving the motor are provided inside the second inner ring of the second shell; the fan is also provided with a base, the cover is located at the upper end of the base and is rotatably connected to the base, and a reversible hook is provided at the bottom of the base, which is used to hang the entire fan upside down.

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